Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? c) What is the enthalpy of stream 4? Hot Side 6. Condenser 2nd Stage Compressor Throttle Valve 7 Flash Vapor Phase Only. Chamber 1st Stage Compressor Throttle Valve Evaporator Cold Side

Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? c) What is the enthalpy of stream 4? Hot Side 6. Condenser 2nd Stage Compressor Throttle Valve 7 Flash Vapor Phase Only. Chamber 1st Stage Compressor Throttle Valve Evaporator Cold Side

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 9RQ: The evaporator design temperature may in some cases operate at a slightly ____(higher or lower)...

See similar textbooks

Similar questions

3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kg
Indonesia Inggris A single effect evaporator was used to concentrate 8000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 25 ° C. The evaporator is operated on Steam (85% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 75 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) The rate of demand for steam? b. Steam economy if condensate temperature is released at 75 ° C.?
Q1: Steum at a pressure of 28kpa is passed into a condenser and it leawes as condensate at a temperature of sac Cooling water circulates through the condenser at the rate of 45 kg/min - It enters at 152 and Veaves at 3oc If the Steam flow rate is 1.25 eg/min, determinė the drynes fraction of Steam as it enters the condenser.
回MO zain IQ Asiacell The thermodynamic properties of refrigerant R22 mixture of liquid and vapor leaving the expansion device and entering the evaporator are; pressure of 498 kPa, temperature of O °C, fraction dryness (x) of 0.238, saturated liquid enthalpy of 200 kJ/kg, and saturated vapour enthalpy of 405 kJ/kg. The pressure of this refrigerant at the entrance of the condenser is measured to be 19.3 bar. After the subcooling process, the enthalpy in (kJ/kg) and the pressure in (MPa) of this refrigerant have been measured and were found to be 199.47 kJ/kg and 2.3 MPa none of these answers. 199.47 J/kg and 2.3 Pa 239. 68 kJ/kg and 1.96 MPa 248.79 J/kg and 1.93 Pa 248.79 kJ/kg and 1.93 MPa
1.) Determine the refrigerant name and chemical formula of R-22 2.) An ice plant produces 20 tons of ice per day at -15oC from water at 25 oC. If miscellaneous losses are 12 % of the freezing and chilling load, calculate the refrigeration capacity of the plant, in TR.
2. Explain how to increase the coefficient of performance of a single stage vapour compression system. Illustrate your analysis through charts (P-h and T-s diagrams)
I am confused about this answer. I somewhat understand the method, however they use the saturated liquid water table instead of the refrigerant table. And using the same method with saturated refrigerant yeilds very high temperatures and pressures that don't really make sense? Please help.
Steam is delivered to turbine at 5.4 MPa and 600 degree C. Before condensation at 31 degree C, steam is extracted for feed water heating at 0.6 MPa. The turbine exhaust is 60 degree C. the required values of some state point properties are tabulated below. 7. Determine the quality of steam at the condenser inlet.
How many tons of refrigeration are required to produce 10 metric tons of ice per day at -10 °C from raw water at 22 °C if miscellaneous losses are 15% of the chilling and freezing load? 3.
3. Name the principal parts of a simple vapour compression system
15. A test tube for boiling water has a diameter of 25 mm. Water at a rate of 100 kg/h enters the uniformly heated tube. If pressure is 7.5 MPa, find the heat transfer coefficient and heat flux at a location where mixture quality is 0.25. ATsat = 10 C.
Figure below shows a steam jet refrigeration system that produces chilled water in a flash chamber. The chamber is maintained at a pressure by the steam ejector, which removes the vapor generated by entraining it in the low-pressure jet and discharging into the condenser. The vacuum pump removes air and other non-condensable gases from the condenser shell. For the conditions shown on the figure, determine the make-up water and cooling water flow rates in kg/hr. Show diagrams if there are any